Experimental evaluation of crumb rubber and polyethylene integrated modified asphalt mixture upon related properties

Using the waste crumb rubber modified asphalt to pave the road surface could reduce cost and save energy. However，in order to obtain adequate workability, the mixing temperature and compaction temperature of rubberized asphalt binder and its mixture is much higher than those of conventional asphalt mixtures. Warm Mix Asphalt (WMA) is the name given to certain technologies that reduce the production and placement temperatures of asphalt mixes. One of the main benefits advertised is the increased workability at conventional and lower compaction temperatures with the WMA addition. This paper evaluates whether there are any synergy effects of using warm mix technologies and Asphalt Rubber(AR) hot mixes. This paper summarizes a lab research to evaluate the workability of Asphalt Rubber hot mixes containing warm mix technologies. Both asphalt binder and asphalt mixture were evaluated and compared. The research suggests that combining WMA technology with Asphalt Rubber mixtures is a win-win.

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Viscoelastic Mechanical Properties of Crumb Rubber Modified Asphalt Mixture

ICCTP 2009 ◽

10.1061/41064(358)301 ◽

2009 ◽

Author(s):

Lan Wang ◽

Chun-qing Chang ◽

Yong-ming Xing

Keyword(s):

Mechanical Properties ◽

Asphalt Mixture ◽

Crumb Rubber ◽

Modified Asphalt

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Predict the Phase Angle Master Curve and Study the Viscoelastic Properties of Warm Mix Crumb Rubber-Modified Asphalt Mixture

Materials ◽

10.3390/ma13215051 ◽

2020 ◽

Vol 13 (21) ◽

pp. 5051

Author(s):

Fei Zhang ◽

Lan Wang ◽

Chao Li ◽

Yongming Xing

Keyword(s):

Phase Angle ◽

Dynamic Modulus ◽

Master Curve ◽

Loss Modulus ◽

Asphalt Mixture ◽

Crumb Rubber ◽

Asphalt Mixtures ◽

Master Curves ◽

Modified Asphalt ◽

Sigmoidal Model

To identify the most accurate approach for constructing of the dynamic modulus master curves for warm mix crumb rubber modified asphalt mixtures and assess the feasibility of predicting the phase angle master curves from the dynamic modulus ones. The SM (Sigmoidal model) and GSM (generalized sigmoidal model) were utilized to construct the dynamic modulus master curve, respectively. Subsequently, the master curve of phase angle could be predicted from the master curve of dynamic modulus in term of the K-K (Kramers–Kronig) relations. The results show that both SM and GSM can predict the dynamic modulus very well, except that the GSM shows a slightly higher correlation coefficient than SM. Therefore, it is recommended to construct the dynamic modulus master curve using GSM and obtain the corresponding phase angle master curve in term of the K-K relations. The Black space diagram and Wicket diagram were utilized to verify the predictions were consistent with the LVE (linear viscoelastic) theory. Then the master curve of storage modulus and loss modulus were also obtained. Finally, the creep compliance and relaxation modulus can be used to represent the creep and relaxation properties of warm-mix crumb rubber-modified asphalt mixtures.

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Laboratory and Field Investigation of the Feasibility of Crumb Rubber Waste Application to Improve the Flexibility of Anti-Rutting Performance of Asphalt Pavement

Materials ◽

10.3390/ma11091738 ◽

2018 ◽

Vol 11 (9) ◽

pp. 1738 ◽

Cited By ~ 4

Author(s):

Hongyin Li ◽

Hailong Jiang ◽

Wenwu Zhang ◽

Peng Liu ◽

Shanshan Wang ◽

...

Keyword(s):

Resilient Modulus ◽

Asphalt Pavement ◽

Asphalt Mixture ◽

Crumb Rubber ◽

Field Investigation ◽

Compression Tests ◽

Modified Asphalt ◽

Asphalt Mix ◽

Low Temperature Cracking ◽

Indirect Tensile

Resistance of asphalt mix to low-temperature cracking and rutting at high temperature is very important to ensure the service performance of asphalt pavement under seasonal changes in temperature and loading. However, it is challenging to balance the improvement of such resistance by using additives, e.g., anti-rutting agent (ARA). This study focuses on improving the flexibility of anti-rutting asphalt mix by incorporating crumb rubber (CR) and ARA. The properties of the prepared modified asphalt mix were evaluated in the laboratory by performing wheel tracking, three-point bending, indirect tensile, and uniaxial compression tests. The experimental results showed that the dynamic stability of modified asphalt mix was significantly increased due to the addition of ARA and further improved by incorporating CR. The maximum bending strain at −10 °C was increased due to the contribution of CR. The results of indirect tensile strength and resilient modulus further indicated that the CR-modified anti-rutting mixture was more flexible. Moreover, the field observation and evaluation indicated that the CR-modified anti-rutting asphalt pavement met the standard requirements, better than normal asphalt mixture in many parameters. A conclusion can be made that incorporating CR in asphalt mixture prepared with ARA can improve pavement performance at both high and low in-service temperatures.

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A review of the best experience on crumb rubber – dry process modified asphalt mixture performance

10.5592/co/cetra.2020.1323 ◽

2021 ◽

Author(s):

Ovidijus Šernas ◽

Audrius Vaitkus ◽

Deimantė Kilaitė

Keyword(s):

Asphalt Mixture ◽

Crumb Rubber ◽

Asphalt Mixtures ◽

Waste Products ◽

Dry Process ◽

Modified Asphalt ◽

Wet Process ◽

Water Sensitivity ◽

Modification Process ◽

Dry Modification

The use of crumb rubber made from end of life tyres for asphalt mixtures modification in order to improve their properties or just utilize waste products may be considered as potential solution. Crumb rubber can be used as a bitumen modifier (wet process) or supplementary component of the asphalt mixture (dry process). Dry modification process has more potential due relatively unsophisticated technology and higher possible to use amount of crumb rubber comparing to the wet process. The performance of asphalt mixtures modified by dry process mainly depends on several factors as crumb rubber type, content and size. However, limited number of publications reported the results of dry method crumb rubber modified asphalt mixtures performance. This paper summarizes the latest findings from literature review on the modification technologies and specifications related to dry modification process, the effect of crumb rubber type and amount on modified asphalt mixture performance in terms of stiffness, rutting resistance, water sensitivity, resistance to fatigue and low temperature cracking. The algorithm of crumb rubber modified asphalt mix design was introduced.

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Effect of Addition of Dry Crumb Rubber on the Performance of Terminal Blend Crumb Rubber Modified Asphalt Mixtures

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/2633-11 ◽

2017 ◽

Vol 2633 (1) ◽

pp. 90-97 ◽

Cited By ~ 3

Author(s):

Salih Kocak ◽

M. Emin Kutay

Keyword(s):

Asphalt Binder ◽

Asphalt Mixture ◽

Crumb Rubber ◽

Asphalt Mixtures ◽

Fine Aggregate ◽

Dry Process ◽

Modified Asphalt ◽

Wet Process ◽

Low Temperature Cracking ◽

Linear Viscoelastic

Three major methods are used to produce crumb rubber modified asphalt pavement: the dry process (CRDry), the terminal blend process (CRTB), and the wet process (CRWet). Although the CRDry process replaces the portion of fine aggregate in the asphalt mixture with crumb rubber (CR) particles, the CRWet process incorporates CR particles into hot liquid asphalt before it is mixed with aggregates. CRTB is known as a special type of CRWet process in which the CR is blended with asphalt binder at the asphalt terminal. In general, the CRWet process can integrate 15% to 22% CR by weight of the binder. This amount ranges from 10% to 12% in the CRTB process as a result of the limitations associated with transportation and pumping. This study investigated the feasibility of increasing the CR content of CRTB modified asphalt mixtures. The addition to the mixture of about 0.5% CR (by weight of the mix) through the CRDry process doubled the amount of rubber to be found in a conventional CRTB mix. The relative performances of the CRTB and the CRTB+CRDry processes [i.e., crumb rubber hybrid (CRHY)] were investigated with respect to their linear viscoelastic properties, rutting susceptibility, moisture damage, resistance to fatigue, and low temperature cracking. It was shown that it was possible to increase the amount of CR in the mixture through the use of the CRHY method proposed here, without adverse effect on the performance of the mixture.

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Study on Durability of Granulated Crumb Rubber Asphalt Pavement Based on TPS High-Viscosity Asphalt

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.587-589.985 ◽

2014 ◽

Vol 587-589 ◽

pp. 985-989 ◽

Cited By ~ 1

Author(s):

Yong Shou Yang ◽

Qiang Dong

Keyword(s):

Asphalt Pavement ◽

Water Immersion ◽

Asphalt Mixture ◽

Crumb Rubber ◽

High Viscosity ◽

Water Stability ◽

Mineral Aggregate ◽

Modified Asphalt ◽

Adhesion Ability ◽

Sbs Modified Asphalt

In order to improve the durability of granulated crumb rubber asphalt pavement, different amount of TPS modifier are added into granulated crumb rubber asphalt mixture to do tests of water-boiling, water immersion, immersing Marshall, cantabro immersion and some other indoor experiments. Through comparing with base asphalt and SBS modified asphalt, we found that the adhesion ability of asphalt and mineral aggregate and crumb rubber were granulated after adding TPS modifier. The water stability of granulated crumb rubber asphalt mixture is improved. The durability of granulated crumb rubber asphalt mixture has also been improved dramatically. In additions, the optimum mixing volume of TPS for granulated crumb rubber asphalt mixture is 12%; the mixing temperature of asphalt mixture is 185°C.

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Performance experimental evaluation of compound modified asphalt by pyrophosphate and crumb rubber

2011 Second International Conference on Mechanic Automation and Control Engineering ◽

10.1109/mace.2011.5988395 ◽

2011 ◽

Author(s):

Xiaoqun Jin ◽

Tongyuan Ni

Keyword(s):

Experimental Evaluation ◽

Crumb Rubber ◽

Modified Asphalt

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Challenges Associated with Optimisation of Blending, Mixing and Compaction Temperature for Asphalt Mixture Modified with Crumb Rubber Modifier (CRM)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.1837 ◽

2012 ◽

Vol 256-259 ◽

pp. 1837-1844 ◽

Cited By ~ 4

Author(s):

Iman Mohammadi ◽

Hadi Khabbaz

Keyword(s):

Asphalt Mixture ◽

Crumb Rubber ◽

Test Methods ◽

Asphalt Binders ◽

Asphalt Pavements ◽

Compaction Temperature ◽

Modified Asphalt ◽

Wide Range ◽

Modified Binder ◽

Very High

The use of modified asphalt binders has become much more common over the past two decades. Many types of modifier have been used in paving asphalts to enhance the performance of asphalt pavements in a wide range of climates and loading conditions. Among various asphalts binder modifiers, the recycled crumb rubber has been used very successfully for many years. Generally in production of CRM binder, mixing and compaction temperature is determined by measuring of binder viscosity. The ordinary method used for viscosity measurement of unmodified binder leads to a very high Mixing and Compaction Temperature (MCT) for CRM binder. The aims of this paper are to identify, develop and give some recommendations on a reliable laboratory approach for blending of CRM with binder, as well as introducing appropriate laboratory test methods for optimisation of MCT of crumb rubber modified binder asphalt.

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